Weighted Extended B-Spline Approximation of Dirichlet Problems. - Klaus Höllig; Ulrich Reif; Joachim Wipper (SIAM J. Numer. Anal., 2001)

Multigrid methods with web-splines. - Klaus Höllig; Ulrich Reif; Joachim Wipper (Numerische Mathematik, 2002)

The geometric element transformation method for mixed mesh smoothing. - Dimitris Vartziotis; Joachim Wipper (Eng. Comput., 2009)